My module (now v0.02!) doesn't seem to suffer from the garbage collection problem, and it doesn't require you tell it what kind of reference you expect back. It's not pure Perl (unlike Devel::Pointer::PP), but it is easier to use.
(Update: I misinterpreted the garbage collection issue.)
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Jeff japhy Pinyan,
P.L., P.M., P.O.D, X.S.:
Perl,
regex,
and perlhacker How can we ever be the sold short or the cheated, we who for every service have long ago been overpaid? ~~ Meister Eckhart